Hello Enthusiasts, I’ve been doing some reading of previous posts on air conditioning, and have all but decided that I would like to convert my AC back to R12 from R134 as I spend a lot of time in Florida with a Black on Black 420 SEL. What is this going to involve? Is it as simple as having a licensed shop evacuate the R134 and recharge with the R12 or what? What do you guys think about going back to R12 anyway? Thanks…
R134 AC Back to R12... What am I Getting Into?
J Dubb
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Hello Enthusiasts, I’ve been doing some reading of previous posts on air conditioning, and have all but decided that I would like to convert my AC back to R12 from R134 as I spend a lot of time in Florida with a Black on Black 420 SEL. What is this going to involve? Is it as simple as having a licensed shop evacuate the R134 and recharge with the R12 or what? What do you guys think about going back to R12 anyway? Thanks…
i've wondered about this too. but more along the lines of changing a newer R134 car to R12. as for your situation, you'll have a hell of a time finding a shop willing to do this. i can personally get ahold of R12 whenever i want. i have a hookup to buy R12 that is intended to be sold in a limited quantity to licensed shops. the other route is getting it from mexico. how, i don't know.. but i know people who have done it.
I don't think that you will be able to find a shop that will re-convert your system (it might be illegal, and I don't think they would risk themselves for you... not a personal insult).
I have heard that in the R-12 to R-134a conversion that R-134a is a much denser than R-12, so when it is converted it should only be recharge to about 75%-80% of capacity. So if you had a 2lbs system with R-12, you would only put 1.5lbs-1.6lbs of R-134a.
If the shop put in 2lbs of R-134a into a R-12, then when the freon is traveling through the condenser it will slow down (bottleneck) and result in poor cooling. Alot of us have poor cooling in our 126's, but if you look at the other posts some have great cooling A/C.
Eric
I have heard that in the R-12 to R-134a conversion that R-134a is a much denser than R-12, so when it is converted it should only be recharge to about 75%-80% of capacity. So if you had a 2lbs system with R-12, you would only put 1.5lbs-1.6lbs of R-134a.
If the shop put in 2lbs of R-134a into a R-12, then when the freon is traveling through the condenser it will slow down (bottleneck) and result in poor cooling. Alot of us have poor cooling in our 126's, but if you look at the other posts some have great cooling A/C.
Eric
I've done conversions back to R12.. To do it right is involved.. One must flush the whole system and to do so the expansion valve has to come out. The compressor also needs to be removed and flushed.
Couple that w/ all new o-rings (R134a oil does a Number old R12 rubber), a fresh drier and you are set to revert back.
134a works well in areas that don't see over 90F. I believe 126's hold 2.9lbs of R12. 134a is a far less efficient molecule, it also runs considerably higher head pressures thus stressing the componentry more so then R12 would.
Jonathan
Couple that w/ all new o-rings (R134a oil does a Number old R12 rubber), a fresh drier and you are set to revert back.
134a works well in areas that don't see over 90F. I believe 126's hold 2.9lbs of R12. 134a is a far less efficient molecule, it also runs considerably higher head pressures thus stressing the componentry more so then R12 would.
Jonathan
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